Cugini P, Salandri A, Petrangeli C M, Capodaglio P F, Giovannini C
Chronobiology Unit, University of Rome, La Sapienza, Italy.
Chronobiol Int. 1996 Nov;13(5):359-71. doi: 10.3109/07420529609012660.
The study investigates how the human body composition (BC) changes as a function of the day-night cycle. The BC was investigated using bioelectrical impedance analysis (BIA) of 10 clinically healthy subjects (CHS), monitored in supine position (readings at 2-h intervals), avoiding mealtimes, dietary abuses, and bladder and intestinal retention. Time series data were analyzed for their temporal characteristics and circadian rhythm (CR). All the variables of BC (lean body mass, fat body mass, body cell mass, total body water, intracellular and extracellular body water, sodium and potassium exchangeable pool) showed a within-day variability with nighttime crests. Such an oscillatory synchronism corroborates the hypothesis that the rest time plays a fundamental role, via its anabolic effects, in conferring the nocturnal phase to the CR of the human BC.
该研究调查了人体成分（BC）如何随昼夜周期而变化。使用生物电阻抗分析（BIA）对10名临床健康受试者（CHS）的BC进行了研究，受试者处于仰卧位（每2小时读数一次），避免用餐时间、饮食不当以及膀胱和肠道潴留。对时间序列数据进行了时间特征和昼夜节律（CR）分析。BC的所有变量（瘦体重、脂肪体重、身体细胞质量、总体水、细胞内和细胞外身体水、钠和钾可交换池）均显示出日内变异性，且在夜间出现峰值。这种振荡同步性证实了以下假设：休息时间通过其合成代谢作用，在赋予人体BC的CR夜间相位方面发挥着重要作用。
